Locking device.



PATENTED APR. 7, 1908. A. M. DE OGA. I LOOKING DEVICE.

APPLICATION FILED OCT. 11, 1907.

, y v k 1 uv a V mum J A770HNEYS mm; STATES PATENT oF rcE;

' AGUSTIN MONTES DE OGA, OF MEXICO, MEXICO.

LOOKIN G DEVICE.

Specification of Letters Patent.

Application filed October 11, 1907. Serial noqssassa.

Patented April 7, 1908..

Tdallwhom itmay concern:

Be it known that I, AGUsTIN' MONTES DE A, a citizen of the Republic of Mexico,

- and a resident ofMexico, Mexico, have inand combination of parts to be more fully deupper face with a posed ratchet teet scribed hereinafter and particularly set forth in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of a portion of a shipping case to which the invention has been applied, certain parts being broken away and shown in cross section; Fig. 2 is a per spective of a locking ring which constitutes a feature of the invention; and Fig. 3 is a perspective showing thehead and upper portion 0 thescrew.

Referring more particularly to the parts, 1

represents the body of a box or shipping case," the same having a cover 2 which is held in 35? place by a screw 3 constructed according to my invention. This screw has a body of ordinary form, but the under side of its head 4 is provided with a plurality of radially disposed ratchet teeth 5 which incline rearwardly with respect to the direction of rotation of the screw when it is advancing into the.

wood. Before. thescrew is placed in the hole 6 bored to receive it, I place over the body of the screw a locking ring 7 which is fully illustrated Fig.2. The body of this locking ring isof annular form and is provided on its lurality of radially dish 8 which incline forwardly with respect to the direction of rotation of the screw when it is being advanced in the wood. These-ratchet-teeth 8 match I the ratchet teeth 5, being'of the same pitch and dimensions. At diametrically opposite points, the locking ring 7 is provided with parallel spurs 9 which are adapted to'be driven into-the outer face of the cover 2 before the screw seats itself, as indicated in Fig. 1.

The locking ring 7.has a central opening 10 which is of sufficiently large diameter to fit neatly on the body of the screw 3, so that .the ring will be properly centered when driven into position as described. When the screw is seated, the ratchet teeth 5 on the under side of the head thereof engage with the ratchet teeth 8, as illustrated in Fig. 1, and effectually prevent the unscrewing of the screw.

. Attention is called to the fact that the spurs'9, are offset, so that their butts are presented beyond the periphery of the locking rin This construction materially facilitates t e driving in of the spurs, as the blows 'of the hammer ma be delivered u on the spurs without stri ing the teeth 1n their vicinity.

Having thusdescribed my invention, I claim as new and desire to secure by Letters Patent:

1. A screw having a body and a head, an annular locking member adapted to be received under said head, said locking member having spurs on the under side thereof adapted to be driven inwardly in the direction in which the bolt or screw advances,'and interlocking means between the under side of said head and said locking member, said spurs being offset beyond the eriphery of said locking member to form a butt to receive'hammer blows.

- 2. In combination, a screw having a head with a plurality of radially disposed ratchet teeth on the under side thereof, and a locking I ring having a' body with teeth on the upper I face thereof adapted to engage said first teeth, and having spurs projecting in the direction of the body of the screw, said s urs being offset beyond the edge of said 100 'ng rin to form butts to receive hammer blows. testimony whereof; I have signed my name to this specification in the presence of two subscribing witnesses. AGUSTIN MONTES DE QCA. Witnessesr PEDRO ESCUDERO,

LUIs HELGUERA. 

